什么是 “Hello, World!”

“Hello, World!” 程序是编程世界的第一个仪式。

当你在新语言中写下这行代码并看到它成功输出时，就完成了与这门语言最初的握手。它简单到近乎平淡，却又至关重要——既是初学者验证语法规则的入门练习，也是开发者确认环境配置无误的快速检查。

这个传统始于1972年贝尔实验室的《A Tutorial Introduction to the Language B》，如今已成为跨越所有编程语言的共同起点。它不只是一段代码，更像是程序员之间的默契：如果连 “Hello, World!” 都跑不通，那更复杂的挑战也不必继续了。

“Hello, World!” 的 N 种写法

Ada

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with Ada.Text_IO;
use Ada.Text_IO;
procedure Hello is
begin
    Put_Line ("Hello, World!");
end Hello;

ALGOL60

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BEGIN DISPLAY("Hello, World!") END.

ALGOL68

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begin
    printf(($gl$,"Hello, World!"))
end

AppleScript

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say "Hello, World!"
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display alert "Hello, World!"

Assembly Language (Linux x64)

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section .text
global _start

_start:
    ; sys_write(1, msg, len)
    mov  rax, 1
    mov  rdi, 1
    lea  rsi, [rel msg]
    mov  rdx, len
    syscall

    ; sys_exit(0)
    mov  rax, 60
    xor  rdi, rdi
    syscall

section .rodata
msg: db "Hello, World!", 0xA
len: equ $ - msg

BASIC

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PRINT "Hello, World!"

Batchfile

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@echo off
echo Hello, World!

Bash

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echo "Hello, World!"

C

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#include <stdio.h>

int main() {
    printf("Hello, World!");
    return 0;
}

C++

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#include <iostream>

int main() {
    std::cout << "Hello, World!" << std::endl;
    return 0;
}

c#

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Console.WriteLine("Hello, World!");

Clojure

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(println "Hello, World!")

COBOL

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IDENTIFICATION DIVISION.
PROGRAM-ID. HELLO-WORLD.
* simple hello world program
PROCEDURE DIVISION.
    DISPLAY 'Hello, World!'.
    STOP RUN.

D

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import std.stdio;

void main() {
    writeln("Hello, World!");
}

Dart

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void main() {
    print('Hello, World!');
}

Elixir

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IO.puts("Hello, World!")

Ezhil

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பதிப்பி "உலகே வணக்கம்"
பதிப்பி "Hello, World!"
exit()

Forth

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." Hello, World!" CR

Fortran

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program Hello
    print *, "Hello, World!"
end program Hello

Go

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package main
import "fmt"

func main() {
    fmt.Println("Hello, World!")
}

Haskell

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main :: IO ()
main = putStrLn "Hello, World!"

Java

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public class Main {
    public static void main(String[] args) {
        System.out.println("Hello, World!");
    }
}

JavaScript

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console.log("Hello, World!");
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document.write("Hello, World!");

Julia

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println("Hello, World!")

Kotlin

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fun main() {
    println("Hello, World!")
}

Lisp

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(print "Hello, World!")
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print [Hello, World!]

Lua

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print("Hello, World!")

Objective-C

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#import <stdio.h>

int main() {
    printf("Hello, World!\n");
}
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#import <Foundation/Foundation.h>

int main(int argc, const char * argv[]) {
    @autoreleasepool {
        NSLog(@"Hello, World!");
    }
    return 0;
}

OCaml

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print_endline "Hello, World!"

Pascal

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program Hello;
begin
    writeln ('Hello, World!');
end.

Perl

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print "Hello, World!\n";

Perl6

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say 'Hello, World!'

PHP

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<?php
    echo 'Hello, World!';
?>

PowerShell

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'Hello, World!'

Prolog

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main() :- write("Hello, World!"), nl.

Python2

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print "Hello, World!"

Python3

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print("Hello, World!")

R

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print("Hello, World!")

Racket

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#lang cli
(displayln "Hello, World!")

Ruby

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puts "Hello, World!"

Rust

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fn main() {
    println!("Hello, World!");
}

Simula

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Begin
    OutText ("Hello, World!");
    Outimage;
End;

Smalltalk

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Transcript show: 'Hello, World!'.

Standard ML

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print "Hello, World!\n"

Swift

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print("Hello, World!")

Tcl

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puts "Hello, World!"

TI-BASIC

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:Disp "Hello, World!"

VBScript

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WScript.Echo "Hello, World!"

WebAssembly Text Format

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(module
    (import "console" "log" (func $log (param i32)))
    (memory 1)
    (data (i32.const 0) "Hello, World!\00")
    (func (export "hello")
        (call $log (i32.const 0))
)

易语言

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信息框（“Hello, World!”,0,,）